M4 Series Metal Hi-Cap 190rds VN Type Magazine for Airsoft Marui G&P Standard AEG [For Airsoft Only] For M4 / M16 of Airsoft AEG Rifle It is a winding magazine that is perfect for military simulation games and most national operations 190 Rounds of loading capacity are enough for most competition & skirmish airsoft game Large thumb dial on bottom of magazine allow you to wind up the compression spring Open Case Design let you very easy to refill the BB Bullet